From: Marcus Bointon Date: April 7 2008 10:24am Subject: Re: Master - Slave MySQL Database Server List-Archive: http://lists.mysql.com/replication/1202 Message-Id: MIME-Version: 1.0 (Apple Message framework v919.2) Content-Type: multipart/signed; boundary=Apple-Mail-7--524082273; micalg=sha1; protocol="application/pkcs7-signature" --Apple-Mail-7--524082273 Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit On 7 Apr 2008, at 11:09, Kaushal Shriyan wrote: > is this a correct documentation > http://howtoforge.com/mysql_master_master_replication for Master Slave > Replication Well, it's for master-master, not master-slave. Also see http://www.onlamp.com/pub/a/onlamp/2006/04/20/advanced-mysql-replication.html > My requirement was if the Master goes down, the slave should take > care and > act as Master. the Master should acts as slave and reversing of this > role. > is this possible Yes. With master-master, neither machine is considered a slave (actually they are both slaves too). However, there are good practical reasons to treat one as a master, for example it may be on superior hardware, or you need to ensure transactional integrity which you can't do spread across servers. When you have master-master up and running, you need to deal with failover at the application level - so your app needs to know about both servers and know to try the other one if its default connection fails. > Also how can i test this setup from the MySQL client. Any test cases > available would be of great help to test out this MySQL Database > Master and > Slave Server It's easy to test - log into each instance. Do an insert on one and it should be available pretty much immediately from the other, then test it in the other direction. Then try the same thing for deletes. After that, you just need to monitor the 'seconds_behind_master' field in the output from "show slave status" on each. Most guides neglect to tell you about: mysqldump -u root -p --opt --quick --single-transaction --master-data mydb > mydb.sql If you're using InnoDB everywhere, this will get you a data dump in a consistent state without having to lock tables or otherwise block access to your DB while you're setting up the replication. Marcus -- Marcus Bointon Synchromedia Limited: Creators of http://www.smartmessages.net/ UK resellers of info@hand CRM solutions marcus@stripped | http://www.synchromedia.co.uk/ --Apple-Mail-7--524082273 Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIILLzCCBN0w ggPFoAMCAQICEHGS++YZX6xNEoV0cTSiGKcwDQYJKoZIhvcNAQEFBQAwezELMAkGA1UEBhMCR0Ix GzAZBgNVBAgMEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBwwHU2FsZm9yZDEaMBgGA1UECgwR Q29tb2RvIENBIExpbWl0ZWQxITAfBgNVBAMMGEFBQSBDZXJ0aWZpY2F0ZSBTZXJ2aWNlczAeFw0w NDAxMDEwMDAwMDBaFw0yODEyMzEyMzU5NTlaMIGuMQswCQYDVQQGEwJVUzELMAkGA1UECBMCVVQx FzAVBgNVBAcTDlNhbHQgTGFrZSBDaXR5MR4wHAYDVQQKExVUaGUgVVNFUlRSVVNUIE5ldHdvcmsx ITAfBgNVBAsTGGh0dHA6Ly93d3cudXNlcnRydXN0LmNvbTE2MDQGA1UEAxMtVVROLVVTRVJGaXJz dC1DbGllbnQgQXV0aGVudGljYXRpb24gYW5kIEVtYWlsMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A 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